Musical instrument tuner



FIG. 1 is a top plan view of a musical instrument tuner showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof; and,

FIG. 6 is a right side elevation view thereof.

The broken lines shown in all views are for illustrative purposes only and form no part of the claimed design; 

The ornamental design for "musical instrument tuner", as shown and described. 